The images were of zonal marking and they posted march early this year I was interested in my own plan B and remember these articles from when i read them I was just didnt know whether it was a 4-2-4 or a 4-2-3-1
"As with a lot of unusual formations featuring versatile, technically-gifted players, it’s sometimes difficult to describe the formation in the traditional fashion. Against Valencia, this site described it as *
‘a loose 4-4-2 / 4-2-4 / 4-2-3-1 shape’, before going onto slightly more confidently define it as a ‘4-2-4ish formation’ in the defeat of Stuttgart, which some commenters objected to, saying it was more of a 4-2-3-1."
http://www.zonalmarking.net/2010/03/19/barcelona-4-2-4-formation-guardiola-messi/
* Doesnt help trying to put it in fm terms does it